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<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="font-awesome-4.7.0/css/font-awesome.min.css">
  <style>
    a{
      font-size: 34px;
      color:red;
    }
    .fa-battery-1{
      color:green;
    }
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</head>
<body>
  <p>
    <a href="#"><em class="fa fa-battery-1"></em>baidu</a>
  </p>
</body>
</html>